Truck cap



FIG. 1 is a perspective view of the top, front and one side of a truck cap showing a first embodiment of my new design;

FIG. 2 is a perspective view of the top rear and opposite side thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a perspective view of the top, front and one side of a truck cap showing a second embodiment of my new design;

FIG. 5 is a perspective view of the top, rear and opposite side of the second embodiment thereof; and

FIG. 6 is a top plan view of the second embodiment thereof. 

The ornamental design for a truck cap, as shown and described. 